Permanent magnet rotor with annular rib coupling

Abstract

A motor rotor includes a hub having a peripheral wall. A metal ring includes an engaging portion. The metal ring is formed by bending a strip of metal plate to form a cylindrical ring. The metal plate includes first and second positioning portions on two ends thereof. The first and second positioning portions are coupled with each other to form the engaging portion. The metal ring is coupled to an inner peripheral face of the peripheral wall of the hub. A magnet ring is coupled to an inner peripheral face of the metal ring.

1. A motor rotor comprising:
 a hub including a peripheral wall having an inner peripheral face; 
 a metal ring including an engaging portion and an inner peripheral face, with the metal ring being formed by bending a strip of metal plate to form a cylindrical ring, with the metal plate including first and second positioning portions on two ends thereof, with the first and second positioning portions being coupled with each other to form the engaging portion, with the metal ring including a coupling section on an outer peripheral face thereof, with the coupling section extending from the first positioning portion to the second positioning portion, and with the coupling section being coupled to the inner peripheral face of the peripheral wall of the hub; and 
 a magnet ring coupled to the inner peripheral face of the metal ring, wherein the coupling section includes a plurality of grooves, and the inner peripheral face of the peripheral wall of the hub includes a plurality of annular ribs coupled in the plurality of grooves. 
 
     
     
       2. The motor rotor as claimed in  claim 1 , with the coupling section being a rugged face coupled with the inner peripheral face of the peripheral wall of the hub. 
     
     
       3. The motor rotor as claimed in  claim 1 , with the first positioning portion including a protrusion, and with the second positioning portion including a groove receiving the protrusion. 
     
     
       4. The motor rotor as claimed in  claim 1 , with the first positioning portion being serrated and including a plurality of first protrusions and a plurality of first grooves, and with the second positioning portion being serrated and including a plurality of second protrusions received in the plurality of first grooves and a plurality of second grooves receiving the plurality of first protrusions. 
     
     
       5. The motor rotor as claimed in  claim 1 , with the hub further including a closed end wall on an end of the peripheral wall, and with the motor rotor further comprising, in combination: a shaft coupled to a center of the closed end wall. 
     
     
       6. The motor rotor as claimed in  claim 1 , with the peripheral wall of the hub further including a plurality of vanes formed on an outer peripheral face thereof. 
     
     
       7. The motor rotor as claimed in  claim 1  wherein each of the plurality of grooves are annular. 
     
     
       8. A motor rotor comprising:
 a hub including a peripheral wall having an inner peripheral face; 
 a metal ring including an engaging portion and an inner peripheral face, with the metal ring being formed by bending a strip of metal plate to form a cylindrical ring, with the metal plate including first and second positioning portions on two ends thereof, with the first and second positioning portions being coupled with each other to form the engaging portion, with the metal ring including a coupling section on an outer peripheral face thereof, with the coupling section extending from the first positioning portion to the second positioning portion, and with the coupling section being coupled to the inner peripheral face of the peripheral wall of the hub; and 
 a magnet ring coupled to the inner peripheral face of the metal ring, wherein the coupling section includes a plurality of ribs, and the inner peripheral face of the peripheral wall of the hub includes a plurality of annular grooves receiving the plurality of ribs. 
 
     
     
       9. The motor rotor as claimed in  claim 8  wherein each of the plurality of ribs are annular. 
     
     
       10. The motor rotor as claimed in  claim 8 , with the coupling section being a rugged face coupled with the inner peripheral face of the peripheral wall of the hub. 
     
     
       11. The motor rotor as claimed in  claim 8 , with the first positioning portion including a protrusion, and with the second positioning portion including a groove receiving the protrusion. 
     
     
       12. The motor rotor as claimed in  claim 8 , with the first positioning portion being serrated and including a plurality of first protrusions and a plurality of first grooves, and with the second positioning portion being serrated and including a plurality of second protrusions received in the plurality of first grooves and a plurality of second grooves receiving the plurality of first protrusions. 
     
     
       13. The motor rotor as claimed in  claim 8 , with the hub further including a closed end wall on an end of the peripheral wall, and with the motor rotor further comprising, in combination: a shaft coupled to a center of the closed end wall. 
     
     
       14. The motor rotor as claimed in  claim 8 , with the peripheral wall of the hub further including a plurality of vanes formed on an outer peripheral face thereof. 
     
     
       15. A metal ring for a motor rotor having a hub and a magnet ring, with the hub including a peripheral wall having an inner peripheral face, with the magnet ring being mounted in the peripheral wall, with the metal ring being adapted to be coupled between the peripheral wall of the hub and the magnet ring and to provide a magnetically sealing effect for the magnet ring, with the metal ring including an engaging portion and an inner peripheral face, with the metal ring being formed by bending a strip of metal plate to form a cylindrical ring, with the metal plate including first and second positioning portions on two ends thereof, with the first and second positioning portions being coupled with each other to form the engaging portion, with the metal ring including a coupling section on an outer peripheral face thereof, with the coupling section extending from the first positioning portion to the second positioning portion, with the coupling section including a plurality of grooves adapted to be coupled with a plurality of annular ribs formed on the inner peripheral face of the peripheral wall of the hub, and with the metal ring being coupled to the inner peripheral face of the peripheral wall of the hub through the coupling section. 
     
     
       16. The metal ring as claimed in  claim 15 , with the coupling section being a rugged face adapted to be coupled with the inner peripheral face of the peripheral wall of the hub. 
     
     
       17. The metal ring as claimed in  claim 15 , with the first positioning portion including a protrusion, and with the second positioning portion including a groove receiving the protrusion. 
     
     
       18. The metal ring as claimed in  claim 15 , with the first positioning portion being serrated and including a plurality of first protrusions and a plurality of first grooves, and with the second positioning portion being serrated and including a plurality of second protrusions received in the plurality of first grooves and a plurality of second grooves receiving the plurality of first protrusions. 
     
     
       19. The metal ring as claimed in  claim 15  wherein each of the plurality of grooves are annular. 
     
     
       20. A metal ring for a motor rotor having a hub and a magnet ring, with the hub including a peripheral wall having an inner peripheral face, with the magnet ring being mounted in the peripheral wall, with the metal ring being adapted to be coupled between the peripheral wall of the hub and the magnet ring and to provide a magnetically sealing effect for the magnet ring, with the metal ring including an engaging portion and an inner peripheral face, with the metal ring being formed by bending a strip of metal plate to form a cylindrical ring, with the metal plate including first and second positioning portions on two ends thereof, with the first and second positioning portions being coupled with each other to form the engaging portion, with the metal ring including a coupling section on an outer peripheral face thereof, with the coupling section extending from the first positioning portion to the second positioning portion, with the coupling section including a plurality of ribs adapted to be coupled with a plurality of annular grooves formed in the inner peripheral face of the peripheral wall of the hub, and with the metal ring being coupled to the inner peripheral face of the peripheral wall of the hub through the coupling section. 
     
     
       21. The metal ring as claimed in  claim 20  wherein each of the plurality of ribs are annular. 
     
     
       22. The metal ring as claimed in  claim 20 , with the coupling section being a rugged face adapted to be coupled with the inner peripheral face of the peripheral wall of the hub. 
     
     
       23. The metal ring as claimed in  claim 20 , with the first positioning portion including a protrusion, and with the second positioning portion including a groove receiving the protrusion. 
     
     
       24. The metal ring as claimed in  claim 20 , with the first positioning portion being serrated and including a plurality of first protrusions and a plurality of first grooves, and with the second positioning portion being serrated and including a plurality of second protrusions received in the plurality of first grooves and a plurality of second grooves receiving the plurality of first protrusions.